Fix generation of randome SERE formulae.

* src/ltlvisit/randomltl.cc: Use the correct flavor of And and Or.
Reported by Etienne Renault.
* NEWS: Mention the bug.

NEWS

 New in spot 0.9a:
 
-  Nothing yet.
+  * Bug fixes:
+    - The random SERE generator was using the wrong operators
+      for "and" and "or", mistaking And/Or with AndRat/OrRat.
 
 New in spot 0.9 (2012-05-09):
 

src/ltlvisit/randomltl.cc

@@ -285,9 +285,9 @@ namespace spot
       proba_[1].setup("boolform", 1, boolform_builder);
       proba_[2].setup("star",    2, bunop_unbounded_builder<bunop::Star>);
       proba_[3].setup("star_b",  2, bunop_bounded_builder<bunop::Star>);
-      proba_[4].setup("and",     3, multop_builder<multop::And>);
+      proba_[4].setup("and",     3, multop_builder<multop::AndRat>);
       proba_[5].setup("andNLM",  3, multop_builder<multop::AndNLM>);
-      proba_[6].setup("or",      3, multop_builder<multop::Or>);
+      proba_[6].setup("or",      3, multop_builder<multop::OrRat>);
       proba_[7].setup("concat",  3, multop_builder<multop::Concat>);
       proba_[8].setup("fusion",  3, multop_builder<multop::Fusion>);